Lug nut

From left: 9 lug nuts and 4 lug nut attached to screw-in wheel studs.
A bolt circle with four lug nuts on an Acura.

A lug nut or wheel nut is a fastener, specifically a nut, used to secure a wheel on a vehicle. Typically, lug nuts are found on automobiles, trucks (lorries), and other large vehicles using rubber tires.